linux-kernel - Re: [PATCH 5/5] sh: dmaengine support for sh7724

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Date:	Thu, 17 Dec 2009 08:42:39 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Nobuhiro Iwamatsu <iwamatsu.nobuhiro@...esas.com>
cc:	Paul Mundt <lethal@...ux-sh.org>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org
Subject: Re: [PATCH 5/5] sh: dmaengine support for sh7724

Hi again

On Thu, 17 Dec 2009, Nobuhiro Iwamatsu wrote:

> Hi,
> 
> 2009/12/8 Paul Mundt <lethal@...ux-sh.org>:
> > On Mon, Dec 07, 2009 at 06:02:24PM -0700, Dan Williams wrote:
> >> On Fri, Dec 4, 2009 at 11:45 AM, Guennadi Liakhovetski
> >> <g.liakhovetski@....de> wrote:
> >> > Add a dmaengine platform device to sh7724, fix DMA channel interrupt numbers.
> >> >
> >> > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
> >> > ---
> >> >
> >> > With this patch dmatest works with channels 0-5, channels 6-11 still don't
> >> > work for some reason... So, feel free to discard it for now, if a complete
> >> > fix would be preferred.
> >>
> >> Does this patch limit operation to channels 0-5?  I leave this one for
> >> Paul to disposition.
> >>
> > There are 6 channels per controller, so the fact that the second
> > controller isn't working could either be cause the driver needs more work
> > to handle multiple controllers properly, or there could be a pinmux issue
> > that hasn't been resolved yet for DMAC1. Both of these cases require the
> > driver to be a bit smarter, but as Guennadi is presently working on these
> > things, doing them incrementally is ok with me. If this gets DMAC0
> > working at least where it wasn't before, it's certainly worth applying.
> > DMAC1 seems to have more problems than just wrong interrupt numbers, so
> > this isn't going to cause any regressions there either.
> >
> > Acked-by: Paul Mundt <lethal@...ux-sh.org>
> 
> This patch can not apply Paul's git/HEAD too.
> I updated patch.
> 
> Acked-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@...esas.com>

Same comment applies as to the other my patch. Paul, I think, you 
indicated, that you've already merged my patch, or at least, that you have 
no problem merging it. Please, do use my original version and not this 
one.

Thanks
Guennadi

> 
> Best regards,
>   Nobuhiro
> 
> -----
> 
> Add a dmaengine platform device to sh7724, fix DMA channel interrupt numbers.
> 
> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
> Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@...auri.org>
> ---
>  arch/sh/include/cpu-sh4/cpu/dma-sh4a.h |    8 ++++----
>  arch/sh/kernel/cpu/sh4a/setup-sh7724.c |   15 +++++++++++++++
>  2 files changed, 19 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/sh/include/cpu-sh4/cpu/dma-sh4a.h
> b/arch/sh/include/cpu-sh4/cpu/dma-sh4a.h
> index f0886bc..c4ed660 100644
> --- a/arch/sh/include/cpu-sh4/cpu/dma-sh4a.h
> +++ b/arch/sh/include/cpu-sh4/cpu/dma-sh4a.h
> @@ -19,10 +19,10 @@
>  #elif defined(CONFIG_CPU_SUBTYPE_SH7723) || \
>        defined(CONFIG_CPU_SUBTYPE_SH7724)
>  #define DMTE0_IRQ	48	/* DMAC0A*/
> -#define DMTE4_IRQ	40	/* DMAC0B */
> -#define DMTE6_IRQ	42
> -#define DMTE8_IRQ	76	/* DMAC1A */
> -#define DMTE9_IRQ	77
> +#define DMTE4_IRQ	76	/* DMAC0B */
> +#define DMTE6_IRQ	40
> +#define DMTE8_IRQ	42	/* DMAC1A */
> +#define DMTE9_IRQ	43
>  #define DMTE10_IRQ	72	/* DMAC1B */
>  #define DMTE11_IRQ	73
>  #define DMAE0_IRQ	78	/* DMA Error IRQ*/
> diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
> b/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
> index a52f351..d32f96c 100644
> --- a/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
> +++ b/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
> @@ -23,9 +23,23 @@
>  #include <linux/notifier.h>
>  #include <asm/suspend.h>
>  #include <asm/clock.h>
> +#include <asm/dma-sh.h>
>  #include <asm/mmzone.h>
>  #include <cpu/sh7724.h>
> 
> +/* DMA */
> +static struct sh_dmae_pdata dma_platform_data = {
> +	.mode = SHDMA_DMAOR1,
> +};
> +
> +static struct platform_device dma_device = {
> +	.name	= "sh-dma-engine",
> +	.id		= -1,
> +	.dev	= {
> +		.platform_data	= &dma_platform_data,
> +	},
> +};
> +
>  /* Serial */
>  static struct plat_sci_port scif0_platform_data = {
>  	.mapbase        = 0xffe00000,
> @@ -649,6 +663,7 @@ static struct platform_device *sh7724_devices[]
> __initdata = {
>  	&tmu3_device,
>  	&tmu4_device,
>  	&tmu5_device,
> +	&dma_device,
>  	&rtc_device,
>  	&iic0_device,
>  	&iic1_device,
> -- 
> 1.6.5.4
> 

---
Guennadi Liakhovetski
--
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